Plate heat exchanger unit with exhaust tank

Abstract

This application discloses a plate heat exchanger unit with an exhaust tank, relating to the field of heat exchanger unit technology. It includes a unit base frame, with a plate heat exchanger for heat exchange mounted on one side of the top of the base frame. An exhaust tank assembly for balancing pipeline pressure is mounted at the high point of the plate heat exchanger system. A circulation pump for driving water circulation is connected to the bottom of the plate heat exchanger on the surface of the base frame. A filter for filtering impurities from the water flow is connected to the end of the circulation pump away from the plate heat exchanger. A makeup water pump for replenishing circulating water is mounted on the surface of the pipeline between the circulation pump and the filter. This application performs real-time exhaust based on pipeline air pressure to prevent gas residue and ensure uniform heat dissipation. Furthermore, when water is injected into the pipeline from an empty state, rapid exhaust can be achieved in a very short time.

Description

Technical Field

[0001] This application relates to the field of heat exchanger technology, and in particular to a plate heat exchanger with an exhaust canister. Background Technology

[0002] Plate heat exchangers are widely used in civil buildings such as factories, schools, and residential communities, as well as commercial buildings such as shopping malls, hotels, and restaurants for heating, air conditioning, bathing water, and domestic water. Due to the wide application of plate heat exchangers, there are very high requirements for the operational stability of the heat exchangers. In order for the unit to operate stably, the exhaust valve on the unit is also an essential auxiliary component.

[0003] However, conventional air vents cannot release gases in a timely manner during the operation of HVAC systems. Gases released during water heating (such as hydrogen and oxygen) remain in the pipes. These trapped gases can easily create backflow barriers, leading to poor hot water circulation, cavitation in the circulation pump causing uneven heat dissipation, and, over time, corrosion due to oxidation.

[0004] Meanwhile, conventional exhaust valves generally cannot automatically exhaust air when the pressure is greater than 0.1-0.2MPa. They can only exhaust air when air is introduced or after the first water filling or after an accident repair. The intake and exhaust speed is relatively slow and is only suitable for situations where the intake and exhaust volume is not large. Utility Model Content

[0005] To address the issues of conventional plate heat exchangers failing to exhaust gas in a timely manner, resulting in uneven heat dissipation and oxidation corrosion, and the slow exhaust speed preventing the discharge of large volumes of gas, this application provides a plate heat exchanger with an exhaust tank.

[0006] The plate heat exchanger unit with an exhaust tank provided in this application adopts the following technical solution:

[0007] A plate heat exchanger unit with an exhaust tank includes a unit base frame. A plate heat exchanger for heat exchange is installed on one side of the top of the unit base frame. An exhaust tank assembly for balancing the pressure of the pipeline system is installed on one side of the top of the plate heat exchanger. A circulation pump for driving water circulation is connected to the bottom of the plate heat exchanger on the surface of the unit base frame. A filter for filtering impurities in the water flow is connected to the end of the circulation pump away from the plate heat exchanger. A makeup water pump for replenishing the circulating water is installed on the surface of the pipeline between the circulation pump and the filter.

[0008] By adopting the above technical solution, external moisture is filtered by a filter and then pumped into the plate heat exchanger by a circulating pump for heat exchange. The exhaust tank assembly is installed at the high point of the plate heat exchange system to receive water vapor collected by the plate heat exchanger and various low-point pipelines. Under working pressure, it can discharge the trace amount of air accumulated in the pipeline, eliminating the phenomenon of air blockage in the pipeline at any time. At the same time, when water is injected into the pipeline in an empty state, it can quickly exhaust the air and restore the normal water supply capacity in a short time.

[0009] Preferably, the exhaust tank assembly includes an exhaust tank body disposed on one side of the high point of the plate heat exchanger piping system, and a body connecting pipe is provided on the surface of the exhaust tank body.

[0010] By adopting the above technical solution, the exhaust tank body is connected to the body connecting pipe, thereby receiving the water vapor discharged from the body connecting pipe and temporarily storing it in the exhaust tank body for easy collection and subsequent discharge processes.

[0011] Preferably, the end of the cylinder connecting pipe away from the exhaust tank cylinder is connected to a system main pipeline, and the other end of the system main pipeline is connected to a plate heat exchanger.

[0012] By adopting the above technical solution, the plate heat exchanger is connected to the main pipeline of the system, thereby discharging the gas generated during circulation into the shell connecting pipe, providing a channel for the discharge of water vapor.

[0013] Preferably, an exhaust valve connecting pipe is connected to the top of the exhaust tank body, and an automatic exhaust valve for discharging excess gas in the pipeline is connected to the end of the exhaust valve connecting pipe away from the exhaust tank body.

[0014] By adopting the above technical solution, the exhaust valve connecting pipe is connected to the exhaust tank body to receive the gas emitted from the exhaust tank body. At the same time, as the gas enters, the automatic exhaust valve automatically discharges excess gas according to the gas pressure content in the pipeline to maintain the gas pressure balance in the pipeline.

[0015] Preferably, an exhaust ball valve for preventing moisture leakage is fixed in the middle of the surface of the exhaust valve connecting pipe.

[0016] By adopting the above technical solution, the exhaust ball valve is located between the exhaust tank body and the automatic exhaust valve, thereby blocking the moisture discharged from the exhaust tank body, allowing gas to flow and forming a filtration effect, while controlling the gas discharge flow rate, and maintaining the normal sealing of the pipeline at one end of the automatic exhaust valve.

[0017] Preferably, a flow guide pipe is provided on one side of the surface of the exhaust can body, which is connected to the exhaust valve connecting pipe, and a flow guide ball valve for controlling the flow is fixed at the end of the flow guide pipe away from the exhaust can body.

[0018] By adopting the above technical solution, the guide pipe is connected to the exhaust tank body, thereby providing a discharge channel for the fluid in the exhaust tank body. At the same time, the guide ball valve opens and closes the fluid path in the guide pipe, thereby controlling the flow discharge and maintaining the normal sealing of the pipeline at one end of the guide pipe.

[0019] Preferably, a drain pipe is provided at one end of the guide ball valve away from the guide pipe, and the other end of the drain pipe is connected to an external wastewater collection device.

[0020] By adopting the above technical solution, the drainage pipe is connected to the external wastewater collection device, which facilitates the operation of the personnel and maintains the site environment.

[0021] Preferably, a welded ball valve for controlling the flow rate of the water supply pump is provided on the side of the water supply pump near the filter.

[0022] By adopting the above technical solution, the welded ball valve opens and closes the flow path of the water pumped in by the water supply pump, thereby controlling the water discharge flow rate and maintaining the normal sealing of the pipeline at one end of the water supply pump.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By utilizing the exhaust tank body located at the high point of the plate heat exchanger system, excess water vapor is collected and discharged, and the air pressure in the pipeline system is monitored in real time. This ensures that the trace amount of air accumulated in the pipeline can be discharged under working pressure, preventing water vapor from accumulating in the pipeline, which would lead to poor or unbalanced hot water circulation, uneven temperature control of the radiator, and effectively prevent pipeline corrosion caused by gas oxidation as the water vapor is discharged.

[0025] 2. By synchronously controlling the exhaust ball valve and the guide ball valve, water vapor in the plate heat exchanger unit is separated and discharged to the outside through the automatic exhaust valve and guide pipe, respectively. This avoids the generation of air chambers and bubbles when water vapor mixes and evaporates, thereby increasing the water vapor discharge speed. When water is injected into the pipeline in an empty state, water vapor can be quickly discharged in a very short time, restoring the normal water supply capacity. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall assembly structure of the plate heat exchanger unit in this application;

[0027] Figure 2 This is a schematic diagram of the structural distribution of the exhaust tank assembly in this application.

[0028] Reference numerals: 1. Exhaust tank assembly; 2. Plate heat exchanger; 3. Circulation pump; 4. Make-up water pump; 5. Welded ball valve; 6. Filter; 7. Unit base frame; 8. Automatic exhaust valve; 9. Exhaust ball valve; 10. Exhaust valve connecting pipe;

[0029] 11. Exhaust tank body; 12. Guide pipe; 13. Guide ball valve; 14. Tank body connecting pipe; 15. System main pipeline; 16. Drain pipe. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1-2 This application will be described in further detail.

[0031] This application discloses a plate heat exchanger unit with an exhaust canister.

[0032] Reference Figure 1 , Figure 2 The unit includes a base frame 7. A plate heat exchanger 2 is fixed to one side of the upper end face of the base frame 7 with screws. A hot water delivery pipe is provided on one side of the outer surface of the plate heat exchanger 2 for continuously delivering hot water into the plate heat exchanger 2. A first pipe is sealed and connected to the inlet of the plate heat exchanger 2 at the bottom of the hot water delivery pipe on the other side. The first pipe extends along the surface of the base frame 7 and is connected to a circulation pump 3 at the end of the extension. The output port of the circulation pump 3 is sealed and connected to the first pipe through a flange, thereby forming a connection with the plate heat exchanger 2. The housing of the circulation pump 3 is fixed to the upper end face of the base frame 7 with screws.

[0033] A second pipe is connected to the flange at the inlet end of the circulating pump 3, and a filter 6 is sealed to the other end of the second pipe away from the circulating pump 3 through a flange. The receiving end of the filter 6 is connected to an external water supply device, thereby delivering water to the circulating pump 3. The filter 6 has two-stage filter screens. The coarse filter screen on the side closer to the water supply device is set with a pore size of 3.0 mm, and the fine filter screen on the side away from the water supply device is set with a pore size of 2.5 mm.

[0034] The second pipeline extends laterally to form a branch on one side of the middle section, and a water supply pump 4 is fixed to the upper end of the unit base frame 7 at the end of the branch with screws. The output end of the water supply pump 4 is sealed and connected to the end of the branch through a flange. The pumping end of the water supply pump 4 extends to the outside and connects to the water supply device. When the pressure in the pipeline is lower than the set value, the water supply pump 4 starts automatically to ensure that the water supply directly enters the circulation loop to provide auxiliary water supply to the pipeline. At the same time, a welded ball valve 5 is fixed in the middle of the branch of the second pipeline. The welded ball valve 5 is normally closed and opens when the water supply pump 4 starts. When the water supply pump 4 stops running, the welded ball valve 5 is simultaneously adjusted to the closed state to prevent water backflow in the pipeline.

[0035] Reference Figure 1 , Figure 2The exhaust tank assembly 1 includes an exhaust tank body 11 fixed on one side of the high point of the piping system of the plate heat exchanger 2. A body connecting pipe 14 is provided at the center of the bottom of the outer surface of the exhaust tank body 11. The top of the body connecting pipe 14 is connected to the inside of the exhaust tank body 11, and the bottom of the body connecting pipe 14 is sealed and connected to the main pipeline of the system 15. One end of the main pipeline of the system 15 is welded with a cap, and the other end is connected to the external network. The pipeline below the main pipeline of the system 15 is connected to the plate heat exchanger 2. At this time, the plate heat exchanger 2 and the inside of the exhaust tank body 11 are connected. The exhaust tank body 11 is located higher than the plate heat exchanger 2, which facilitates the discharge of water vapor from the exhaust tank body 11 to the outside.

[0036] An exhaust valve connecting pipe 10 is fixedly installed inside the top surface of the exhaust tank body 11, and an exhaust ball valve 9 is fixedly installed on the side of the exhaust valve connecting pipe 10 away from the exhaust tank body 11. The exhaust ball valve 9 blocks the water flow while maintaining the gas flow, thus forming a water-vapor separation function. An automatic exhaust valve 8 is fixedly installed on one side of the top of the exhaust ball valve 9. The automatic exhaust valve 8 is a pneumatic regulating valve from Shanghai Faden Valve Co., Ltd., and is equipped with a pressure monitor to adjust in real time according to the internal pressure of the pipeline system. When the pressure exceeds the limit value, it automatically... The automatic exhaust valve 8 is adjusted to the open state to release excess gas inside. A guide pipe 12 is fixedly connected to the surface of the exhaust tank body 11 on the other side of the automatic exhaust valve 8. A guide ball valve 13 is fixedly connected to the other end of the guide pipe 12. A drain pipe 16 is sealed and connected to the other end of the guide ball valve 13 relative to the other end of the guide pipe 12. The end of the drain pipe 16 extends into the drainage ditch of the external machine room, thereby discharging the fluid in the exhaust tank body 11 to the outside. This not only facilitates the operators but also eliminates certain safety hazards and maintains the site environment.

[0037] The exhaust tank body 11 is made of seamless steel pipe, with a temperature resistance limit of 350℃ and a pressure resistance range of 1.6MPa to 6.4MPa. The overall length of the exhaust tank body 11 is 200mm, and the exhaust tank body 11 is installed vertically to avoid affecting the system's exhaust. The diameter of the exhaust tank body 11 is the same as the diameter of the main pipeline 15 of the system, and both ends of the exhaust tank body 11 are welded with end caps. This design is simple, convenient, cost-effective, and requires no special processing. The exhaust tank body 11 can prevent high-speed water flow from directly impacting the exhaust ball valve 9 and the automatic exhaust valve 8 after a large amount of exhaust, thus preventing valve damage. The exhaust tank body 11 can also prevent impurities in the system water from clogging the automatic exhaust valve 8, greatly improving the system's anti-clogging performance.

[0038] The cylinder connecting pipe 14 and the guide pipe 12 are both made of seamless steel pipe with a diameter of Φ26.9×3.6; the exhaust valve connecting pipe 10 is made of DN20 external threaded connector; the exhaust ball valve 9 and the guide ball valve 13 are model Q11F-16PDN20, and the diameter can be adjusted according to the actual installation requirements; the automatic exhaust valve 8 is model ZP88-25P DN20, and the diameter can be adjusted according to the actual installation requirements.

[0039] It should be noted that the plate heat exchanger 2, circulating pump 3, water supply pump 4, exhaust ball valve 9, and guide ball valve 13 are all controlled by the PLC logic control system. The exhaust ball valve 9 is normally open. When it is necessary to repair or replace the automatic exhaust valve 8, the PLC logic control system closes the exhaust ball valve 9, so that the pipeline system remains sealed when the automatic exhaust valve 8 is being maintained, and water does not leak out, thus not affecting the normal operation of the unit system.

[0040] The implementation principle of a plate heat exchanger unit with an exhaust tank in this application embodiment is as follows: When using this device, the operator controls the circulating pump 3 to extract the external cold medium through the operating system. The external cold medium is first drawn into the filter 6 for filtration. After filtration, the cold medium is input into the plate heat exchanger 2 by the circulating pump 3 to exchange heat with the heat medium pipeline.

[0041] As heat exchange occurs inside the plate heat exchanger 2, gas or bubbles are generated during the process of cold water heating up and hot water cooling down (a large amount of gas is generated when the system is first filled with water, and a small amount of gas is generated during normal circulation). As the water flows out of the plate heat exchanger 2, the gas rises due to the influence of gas pressure and enters the exhaust tank 11 at the highest point of the system through the main pipeline 15.

[0042] At this time, as the internal air pressure increases, the monitoring device of the automatic exhaust valve 8 provides feedback, controls the automatic exhaust valve 8 to be adjusted to the open state, and sends an electrical signal to the control system, causing the control system to open the exhaust ball valve 9. The gas in the exhaust tank 11 is subjected to the system pressure generated by heat exchange, and is thus transported to the open exhaust ball valve 9 through the exhaust valve connecting pipe 10, so that the gas is discharged to the outside through the automatic exhaust valve 8. As a large amount of gas enters the exhaust tank 11, the moisture in the gas accumulates in the exhaust tank 11. When the fluid in the exhaust tank 11 is full, the exhaust ball valve 9 cannot exhaust gas. At this time, the control system controls the flow guide ball valve 13 to be in the open state (the flow guide ball valve 13 is in the closed state during normal operation), so that the fluid is discharged from the system pipeline through the flow guide pipe 12, thereby allowing the gas and liquid in the pipeline system to be discharged quickly, thus maintaining the stability of the air pressure.

[0043] Then the monitoring device of the automatic exhaust valve 8 provides feedback, and the system enters the normal working state. As gas is continuously input into the cylinder connecting pipe 14, the automatic exhaust valve 8 performs normal exhaust, so that the system pipeline can still discharge the trace amount of air accumulated in the pipeline during normal operation, thus extending the endurance of the internal air pressure.

[0044] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A plate heat exchanger unit with exhaust tank, characterized in that: The unit includes a base frame (7), on one side of the top of the base frame (7) is a plate heat exchanger (2) for heat exchange, on one side of the top of the plate heat exchanger (2) is an exhaust tank assembly (1) for balancing the pressure of the pipeline system, the bottom of the plate heat exchanger (2) is connected to a circulating pump (3) for driving the water flow through a pipeline on the surface of the base frame (7), the end of the circulating pump (3) away from the plate heat exchanger (2) is connected to a filter (6) for filtering impurities in the water flow, and a water replenishment pump (4) for replenishing the circulating water is provided on the surface of the pipeline between the circulating pump (3) and the filter (6).

2. A plate heat exchanger unit with exhaust tank according to claim 1, characterized in that The exhaust tank assembly (1) includes an exhaust tank body (11) located on one side of the high point of the pipeline system of the plate heat exchanger (2), and a body connecting pipe (14) is provided on the surface of the exhaust tank body (11).

3. A plate heat exchanger unit with exhaust tank according to claim 2, characterized in that: The end of the cylinder connecting pipe (14) away from the exhaust tank cylinder (11) is connected to the main system pipeline (15), and the other end of the main system pipeline (15) is connected to the plate heat exchanger (2).

4. A plate heat exchanger unit with exhaust tank according to claim 2, characterized in that: The top of the exhaust tank body (11) is connected to an exhaust valve connecting pipe (10), and the end of the exhaust valve connecting pipe (10) away from the exhaust tank body (11) is connected to an automatic exhaust valve (8) for discharging excess gas in the pipeline.

5. A plate heat exchanger unit with exhaust tank according to claim 4, characterized in that The exhaust valve connecting pipe (10) is fixed with an exhaust ball valve (9) for preventing moisture leakage in the middle of its surface.

6. A plate heat exchanger unit with exhaust tank according to claim 5, characterized in that: A guide pipe (12) is provided on the surface of the exhaust tank body (11) on one side of the exhaust valve connecting pipe (10). A guide ball valve (13) for controlling the flow is fixed at the end of the guide pipe (12) away from the exhaust tank body (11).

7. A plate heat exchanger unit with exhaust tank according to claim 6, characterized in that The guide ball valve (13) is provided with a drain pipe (16) at one end away from the guide pipe (12), and the other end of the drain pipe (16) is connected to an external wastewater collection device.

8. A plate heat exchanger unit with exhaust tank according to claim 1, characterized in that: The water supply pump (4) is provided with a welded ball valve (5) on the side near the filter (6) for controlling the flow rate of the water supply pump (4).

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